<template>
    <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    
    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
    <el-alert
    title="注意：只允许第三级分类设置相关参数"
    type="warning" :closable="false" show-icon>
    </el-alert>

    <!-- 选择商品分类区域 -->
    <el-row class="cat_opt">
        <el-col>
            <span>选择商品的分类：</span>
            <!-- 选择商品分类的级联选择框 -->
            <el-cascader
                v-model="selectedCateKeys"
                :options="catelist"
                :props="{ expandTrigger: 'hover',...cateProps,checkStrictly:true}"
                @change="handleChange" clearable change-on-select></el-cascader>
        </el-col>
    </el-row>

    <!-- tab 页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
        <!-- 展开行 -->
        <el-table-column type="expand">
            <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
            <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete"
                @click="removeParams(scope.row.attr_id)">删除</el-button>
            </template>
        </el-table-column>
        </el-table>
    </el-tab-pane>
        <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
        <!-- 静态属性表格 -->
        <el-table :data="onlyTableData" border stripe>
        <!-- 展开行 -->
        <!-- <el-table-column type="expand">
            <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable>{{item}}</el-tag>
            </template>
        </el-table-column> -->
        <el-table-column type="expand">
            <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
        <el-table-column label="操作">
            <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete"
                @click="removeParams(scope.row.attr_id)">删除</el-button>
            </template>
        </el-table-column>
        </el-table>
    </el-tab-pane>
    </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
    :title="'添加' + titleText"
    :visible.sync="addDialogVisible"
    width="50%"
    @close="addDialogClosed">
    <!-- 添加参数的对话框 -->
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
    </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <!-- 修改参数的对话框 -->
    <el-dialog
    :title="'修改' + titleText"
    :visible.sync="editDialogVisible"
    width="50%"
    @close="editDialogClosed">
    <!-- 添加参数的对话框 -->
    <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
    </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
    </span>
    </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',  
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                    {required: true,message: '请输入参数名称',trigger: 'blur'}
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            // 修改的表单数据对象
            editForm: {},
            // 修改表单的验证规则对象
            editFormRules: {
                attr_name: [
                    {required: true,message: '请输入参数名称',trigger: 'blur'}
                ]
            },
            // 控制按钮与文本框的切换显示
            inputVisible: false,
            // 文本框中输入的内容
            inputValue: '',
        };
    },
    created() {
    this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败！')
            }

            this.catelist = res.data

            console.log(this.catelist);
        },
        // 级联选择框选中变化，会触发这个函数
        handleChange() {
            this.getParamsData()
        // tab页签点击事件的处理函数
        },
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return 
            }

            // 证明选中的是三级分类
            console.log(this.selectedCateKeys);
            // 根据所选的分类的Id，和当前所处的面板，获取对应的参数
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params: { sel: this.activeName }
            })

            if(res.meta.status !== 200) {
                return this.$message.error('获取参数失败！')
            }
            
            console.log(res.data);
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [] 
                
                // 控制文本框的显示与隐藏
                item.inputVisible = false,
                
                // 文本框中输入的值
                item.inputValue = ''

                
            })
            console.log(res.data);
            if(this.activeName === 'many') {
                this.manyTableData = res.data
            }else {
                this.onlyTableData = res.data
            }
        
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮,添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })

                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！')
                } 
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮，展示对话框
        async showEditDialog(attr_id) {
            // 查询当前参数的信息
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {params: {attr_sel: this.activeName}})

            if(res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true

            
        },
        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改参数
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return 
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{ attr_name:this.editForm.attr_name,attr_sel:this.activeName })

                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }
                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err => err)

        // 用户取消了删除
        if(confirmResult !== 'confirm') {
            return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        
        if(res.meta.status !== 200) {
            return this.$message.error('删除参数失败!')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
        },
        // 文本框失去焦点
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false 
            // 需要发起请求，保存这次的操作
            this.saveAttrVals(row)
        },
        // 将对 attr_vals 的参数保存到数据库
            async saveAttrVals(row) {
            // 需要发起请求，保存这次的操作
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })

            if(res.meta.status !== 200) {
                return this.$message.error('修改参数项失败！')
            }

            this.$message.success('修改参数项成功！')
        
        },
        // 点击按钮展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
            // console.log(this.$refs);
        },
        // 删除对应的参数可选项
        handleClose(i,row) {
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed: {
        // 如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}

.el-tag {
    margin: 10px 
}
.input-new-tag {
    width: 120px;
}
</style>